For Those Who Are Installing via USB on Mac...
Download the files from previously mentioned posts.
Open up downloaded RHR 2.136.ISO file. This will place a disc called "My Disc" on the desktop. Open That.
Insert a minimum 4GB USB file that has been erased through Disk Utility. You don't want any other files on there besides what you are about to copy.
Copy the Becker and two CDI files mentioned here:
What version of Application Software did your RHR 730N come with?
Turn Car On.
Insert USB drive into USB port on radio.
Press power on radio to turn radio off.
Wait 5 to 10 Seconds and power Radio back on.
It can take a minute for the USB drive to be recognized.